The question is whether that even resonates anymore with voters or not. Trump's inexperience, and even Obama's, was used against them and it barely mattered after they won. I think we're in a different time.
On the other hand, the four detailed in the article aren't running nationally after a national primary allows all Americans to get acquainted with them, so the familiarity voters in certain states have with this year's Democratic candidates could still be a boon, especially if they've won statewide before. Meanwhile, the non-politicians have never even done anything for their state by comparison and have to run on voters trusting them based on their private personas, which aren't all that compelling among any of them, I think it can be said.
Well people like Walker are both outsiders and totally insane.
Masters is hotter than Kelly, but in a creepy "chad meme IRL" way. Other than that, no, not personally compelling at all unless you spend double-digit hours a week watching or discussing TED talks.